linux/arch/powerpc/kernel/setup_32.c
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   1/*
   2 * Common prep/pmac/chrp boot and setup code.
   3 */
   4
   5#include <linux/module.h>
   6#include <linux/string.h>
   7#include <linux/sched.h>
   8#include <linux/init.h>
   9#include <linux/kernel.h>
  10#include <linux/reboot.h>
  11#include <linux/delay.h>
  12#include <linux/initrd.h>
  13#include <linux/tty.h>
  14#include <linux/bootmem.h>
  15#include <linux/seq_file.h>
  16#include <linux/root_dev.h>
  17#include <linux/cpu.h>
  18#include <linux/console.h>
  19#include <linux/memblock.h>
  20
  21#include <asm/io.h>
  22#include <asm/prom.h>
  23#include <asm/processor.h>
  24#include <asm/pgtable.h>
  25#include <asm/setup.h>
  26#include <asm/smp.h>
  27#include <asm/elf.h>
  28#include <asm/cputable.h>
  29#include <asm/bootx.h>
  30#include <asm/btext.h>
  31#include <asm/machdep.h>
  32#include <asm/uaccess.h>
  33#include <asm/pmac_feature.h>
  34#include <asm/sections.h>
  35#include <asm/nvram.h>
  36#include <asm/xmon.h>
  37#include <asm/time.h>
  38#include <asm/serial.h>
  39#include <asm/udbg.h>
  40#include <asm/mmu_context.h>
  41
  42#define DBG(fmt...)
  43
  44extern void bootx_init(unsigned long r4, unsigned long phys);
  45
  46int boot_cpuid_phys;
  47EXPORT_SYMBOL_GPL(boot_cpuid_phys);
  48
  49int smp_hw_index[NR_CPUS];
  50
  51unsigned long ISA_DMA_THRESHOLD;
  52unsigned int DMA_MODE_READ;
  53unsigned int DMA_MODE_WRITE;
  54
  55#ifdef CONFIG_VGA_CONSOLE
  56unsigned long vgacon_remap_base;
  57EXPORT_SYMBOL(vgacon_remap_base);
  58#endif
  59
  60/*
  61 * These are used in binfmt_elf.c to put aux entries on the stack
  62 * for each elf executable being started.
  63 */
  64int dcache_bsize;
  65int icache_bsize;
  66int ucache_bsize;
  67
  68/*
  69 * We're called here very early in the boot.  We determine the machine
  70 * type and call the appropriate low-level setup functions.
  71 *  -- Cort <cort@fsmlabs.com>
  72 *
  73 * Note that the kernel may be running at an address which is different
  74 * from the address that it was linked at, so we must use RELOC/PTRRELOC
  75 * to access static data (including strings).  -- paulus
  76 */
  77notrace unsigned long __init early_init(unsigned long dt_ptr)
  78{
  79        unsigned long offset = reloc_offset();
  80        struct cpu_spec *spec;
  81
  82        /* First zero the BSS -- use memset_io, some platforms don't have
  83         * caches on yet */
  84        memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
  85                        __bss_stop - __bss_start);
  86
  87        /*
  88         * Identify the CPU type and fix up code sections
  89         * that depend on which cpu we have.
  90         */
  91        spec = identify_cpu(offset, mfspr(SPRN_PVR));
  92
  93        do_feature_fixups(spec->cpu_features,
  94                          PTRRELOC(&__start___ftr_fixup),
  95                          PTRRELOC(&__stop___ftr_fixup));
  96
  97        do_feature_fixups(spec->mmu_features,
  98                          PTRRELOC(&__start___mmu_ftr_fixup),
  99                          PTRRELOC(&__stop___mmu_ftr_fixup));
 100
 101        do_lwsync_fixups(spec->cpu_features,
 102                         PTRRELOC(&__start___lwsync_fixup),
 103                         PTRRELOC(&__stop___lwsync_fixup));
 104
 105        do_final_fixups();
 106
 107        return KERNELBASE + offset;
 108}
 109
 110
 111/*
 112 * Find out what kind of machine we're on and save any data we need
 113 * from the early boot process (devtree is copied on pmac by prom_init()).
 114 * This is called very early on the boot process, after a minimal
 115 * MMU environment has been set up but before MMU_init is called.
 116 */
 117notrace void __init machine_init(u64 dt_ptr)
 118{
 119        lockdep_init();
 120
 121        /* Enable early debugging if any specified (see udbg.h) */
 122        udbg_early_init();
 123
 124        /* Do some early initialization based on the flat device tree */
 125        early_init_devtree(__va(dt_ptr));
 126
 127        early_init_mmu();
 128
 129        probe_machine();
 130
 131        setup_kdump_trampoline();
 132
 133#ifdef CONFIG_6xx
 134        if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
 135            cpu_has_feature(CPU_FTR_CAN_NAP))
 136                ppc_md.power_save = ppc6xx_idle;
 137#endif
 138
 139#ifdef CONFIG_E500
 140        if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
 141            cpu_has_feature(CPU_FTR_CAN_NAP))
 142                ppc_md.power_save = e500_idle;
 143#endif
 144        if (ppc_md.progress)
 145                ppc_md.progress("id mach(): done", 0x200);
 146}
 147
 148/* Checks "l2cr=xxxx" command-line option */
 149int __init ppc_setup_l2cr(char *str)
 150{
 151        if (cpu_has_feature(CPU_FTR_L2CR)) {
 152                unsigned long val = simple_strtoul(str, NULL, 0);
 153                printk(KERN_INFO "l2cr set to %lx\n", val);
 154                _set_L2CR(0);           /* force invalidate by disable cache */
 155                _set_L2CR(val);         /* and enable it */
 156        }
 157        return 1;
 158}
 159__setup("l2cr=", ppc_setup_l2cr);
 160
 161/* Checks "l3cr=xxxx" command-line option */
 162int __init ppc_setup_l3cr(char *str)
 163{
 164        if (cpu_has_feature(CPU_FTR_L3CR)) {
 165                unsigned long val = simple_strtoul(str, NULL, 0);
 166                printk(KERN_INFO "l3cr set to %lx\n", val);
 167                _set_L3CR(val);         /* and enable it */
 168        }
 169        return 1;
 170}
 171__setup("l3cr=", ppc_setup_l3cr);
 172
 173#ifdef CONFIG_GENERIC_NVRAM
 174
 175/* Generic nvram hooks used by drivers/char/gen_nvram.c */
 176unsigned char nvram_read_byte(int addr)
 177{
 178        if (ppc_md.nvram_read_val)
 179                return ppc_md.nvram_read_val(addr);
 180        return 0xff;
 181}
 182EXPORT_SYMBOL(nvram_read_byte);
 183
 184void nvram_write_byte(unsigned char val, int addr)
 185{
 186        if (ppc_md.nvram_write_val)
 187                ppc_md.nvram_write_val(addr, val);
 188}
 189EXPORT_SYMBOL(nvram_write_byte);
 190
 191ssize_t nvram_get_size(void)
 192{
 193        if (ppc_md.nvram_size)
 194                return ppc_md.nvram_size();
 195        return -1;
 196}
 197EXPORT_SYMBOL(nvram_get_size);
 198
 199void nvram_sync(void)
 200{
 201        if (ppc_md.nvram_sync)
 202                ppc_md.nvram_sync();
 203}
 204EXPORT_SYMBOL(nvram_sync);
 205
 206#endif /* CONFIG_NVRAM */
 207
 208int __init ppc_init(void)
 209{
 210        /* clear the progress line */
 211        if (ppc_md.progress)
 212                ppc_md.progress("             ", 0xffff);
 213
 214        /* call platform init */
 215        if (ppc_md.init != NULL) {
 216                ppc_md.init();
 217        }
 218        return 0;
 219}
 220
 221arch_initcall(ppc_init);
 222
 223static void __init irqstack_early_init(void)
 224{
 225        unsigned int i;
 226
 227        /* interrupt stacks must be in lowmem, we get that for free on ppc32
 228         * as the memblock is limited to lowmem by default */
 229        for_each_possible_cpu(i) {
 230                softirq_ctx[i] = (struct thread_info *)
 231                        __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 232                hardirq_ctx[i] = (struct thread_info *)
 233                        __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 234        }
 235}
 236
 237#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
 238static void __init exc_lvl_early_init(void)
 239{
 240        unsigned int i, hw_cpu;
 241
 242        /* interrupt stacks must be in lowmem, we get that for free on ppc32
 243         * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */
 244        for_each_possible_cpu(i) {
 245                hw_cpu = get_hard_smp_processor_id(i);
 246                critirq_ctx[hw_cpu] = (struct thread_info *)
 247                        __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 248#ifdef CONFIG_BOOKE
 249                dbgirq_ctx[hw_cpu] = (struct thread_info *)
 250                        __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 251                mcheckirq_ctx[hw_cpu] = (struct thread_info *)
 252                        __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 253#endif
 254        }
 255}
 256#else
 257#define exc_lvl_early_init()
 258#endif
 259
 260/* Warning, IO base is not yet inited */
 261void __init setup_arch(char **cmdline_p)
 262{
 263        *cmdline_p = cmd_line;
 264
 265        /* so udelay does something sensible, assume <= 1000 bogomips */
 266        loops_per_jiffy = 500000000 / HZ;
 267
 268        unflatten_device_tree();
 269        check_for_initrd();
 270
 271        if (ppc_md.init_early)
 272                ppc_md.init_early();
 273
 274        find_legacy_serial_ports();
 275
 276        smp_setup_cpu_maps();
 277
 278        /* Register early console */
 279        register_early_udbg_console();
 280
 281        xmon_setup();
 282
 283        /*
 284         * Set cache line size based on type of cpu as a default.
 285         * Systems with OF can look in the properties on the cpu node(s)
 286         * for a possibly more accurate value.
 287         */
 288        dcache_bsize = cur_cpu_spec->dcache_bsize;
 289        icache_bsize = cur_cpu_spec->icache_bsize;
 290        ucache_bsize = 0;
 291        if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
 292                ucache_bsize = icache_bsize = dcache_bsize;
 293
 294        if (ppc_md.panic)
 295                setup_panic();
 296
 297        init_mm.start_code = (unsigned long)_stext;
 298        init_mm.end_code = (unsigned long) _etext;
 299        init_mm.end_data = (unsigned long) _edata;
 300        init_mm.brk = klimit;
 301
 302        exc_lvl_early_init();
 303
 304        irqstack_early_init();
 305
 306        /* set up the bootmem stuff with available memory */
 307        do_init_bootmem();
 308        if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 309
 310#ifdef CONFIG_DUMMY_CONSOLE
 311        conswitchp = &dummy_con;
 312#endif
 313
 314        if (ppc_md.setup_arch)
 315                ppc_md.setup_arch();
 316        if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 317
 318        paging_init();
 319
 320        /* Initialize the MMU context management stuff */
 321        mmu_context_init();
 322
 323}
 324